CVE-2020-3259Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Web Services Information Disclosure Vulnerability
Updated under an hour ago ()
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It affects Cisco Adaptive Security Appliance (ASA) Software and 3 other products. Add what you run to find out whether that includes you.
CISA lists it as known exploited since Feb 15, 2024; federal agencies had to remediate by Mar 7, 2024, and it is known to be used in ransomware. Treat that date as your deadline.
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A vulnerability in the web services interface of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to retrieve memory contents on an affected device, which could lead to the disclosure of confidential information. The vulnerability is due to a buffer tracking issue when the software parses invalid URLs that are requested from the web services interface. An attacker could exploit this vulnerability by sending a crafted GET request to the web services interface. A successful exploit could allow the attacker to retrieve memory contents, which could lead to the disclosure of confidential information. Note: This vulnerability affects only specific AnyConnect and WebVPN configurations. For more information, see the Vulnerable Products section.
- CVSS
- 7.5 HIGH (v3.0, CNA)CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- Weakness (CWE)
- CWE-200
- Known exploited
- Added to CISA KEV Feb 15, 2024; federal remediation due Mar 7, 2024; known ransomware useApply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
- EPSS (exploitation in the next 30 days)
- 71.79% (percentile 99)
- Assigned by
- cisco
- NVD analysis
- Analyzed
- Record last updated
- Aug 12, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Cisco Cisco Adaptive Security Appliance (ASA) Software cisco:adaptive_security_appliance_asa_software (from the name) | all versions | CNA record |
cisco firepower_threat_defense cisco:firepower_threat_defense | from 6.2.3 before 6.2.3.16 | CISA ADP |
cisco adaptive_security_appliance_software cisco:adaptive_security_appliance_software | from 9.8 before 9.8.4.20 | CISA ADP |
cisco secure_firewall_threat_defense cisco:secure_firewall_threat_defense | from 6.2.3 before 6.2.3.16; from 6.3.0 before 6.3.0.6; from 6.4.0 before 6.4.0.9; from 6.5.0 before 6.5.0.5 | NVD |
cisco adaptive_security_appliance_software cisco:adaptive_security_appliance_software | from 9.8 before 9.8.4.20; from 9.9 before 9.9.2.67; from 9.10 before 9.10.1.40; from 9.12 before 9.12.3.9; from 9.13 before 9.13.1.10 | NVD |
References
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-info-disclose-9eJtycMBvendor-advisory, x-refsource-cisco
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-3259us-government-resource
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.